-void gradient_render(Surface *sf, int w, int h);
-void gradient_vertical(Surface *sf, int w, int h);
-void gradient_horizontal(Surface *sf, int w, int h);
-void gradient_diagonal(Surface *sf, int w, int h);
-void gradient_crossdiagonal(Surface *sf, int w, int h);
-void gradient_solid(Appearance *l, int x, int y, int w, int h);
+void gradient_render(RrSurface *sf, int w, int h);
+void gradient_vertical(RrSurface *sf, int w, int h);
+void gradient_horizontal(RrSurface *sf, int w, int h);
+void gradient_diagonal(RrSurface *sf, int w, int h);
+void gradient_crossdiagonal(RrSurface *sf, int w, int h);
+void gradient_pyramid(RrSurface *sf, int w, int h);
+void gradient_pipecross(RrSurface *sf, int w, int h);
+void gradient_rectangle(RrSurface *sf, int w, int h);
+void gradient_solid(RrAppearance *l, int x, int y, int w, int h);